The Sum Of Two Numbers Is 81 And Their Difference Is 31
The problem given says that 2 unknown numbers are given, whose sum is equal to 81 and the difference is 31. Let's find the two numbers :When we add the two numbers :
X + Y = 81
The difference of two numbers :
X - Y = 31
Solution :
If we add the two equations eachother , then we can find the first number.
X + Y = 81 X - Y = 31 2X = 112 |
Let's divide 112 to 2 for the first number "X" .
X/2 = 56
First number is 56
X + Y = 81
So ;
56 + Y = 81
Y = 81 - 56
Y = 25
Second number is 25
Question & Answer
The Sum Of Two Numbers Is 81 And Their Difference Is 31 : 56 And 25